A
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It's likely that he has been caught out by the change on DWP guidance in regard to the Going Out activity.
Have a look at the PIP Claim guide there is a discussion of the issues.
You may struggle to meet the requirements of the 12 point Descriptor as this is considered to be an issue of navigation and even if you do, there is a possibility that the DWP may appeal the Decision.
Does he have problems with the distance that he can walk?
If you have questions about the above then please reply to this post and we do our best to help.
Gordon